chore: Update .env.test file with MongoDB and Slack configurations (#37)

- Added MongoDB connection details including host, user, password, and
database name.
- Included Slack token and report channel ID for integration purposes.

These changes enhance the environment configuration for testing and
integration with MongoDB and Slack.

Author: anatolyshipitz

workers/main/.env.test

@@ -2,3 +2,11 @@ REDMINE_DB_HOST=localhost
 REDMINE_DB_USER=testuser
 REDMINE_DB_PASSWORD=testpassword
 REDMINE_DB_NAME=testdb
+
+MONGO_DB_HOST=mongo1:31000
+MONGO_DB_USER=testuser
+MONGO_DB_PASSWORD=testpassword
+MONGO_DB_NAME=testdb
+
+SLACK_TOKEN=test-token
+SLACK_FIN_REPORT_CHANNEL_ID=C02URP5L3U5